Core plug



FIG. 1 is a front, top, right perspective view of a core plug, showingthe new design;

FIG. 2 is a rear, bottom, left perspective thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a cross sectional view thereof taken at the line 9-9 of FIG.4; and,

FIG. 10 is a cross sectional view thereof taken at the line 10-10 ofFIG. 4.

CLAIM The ornamental design for a core plug, as shown and described.